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web/src/decrypt/ncmcache.ts

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2021-12-14 06:57:48 +00:00
import {AudioMimeType, GetArrayBuffer, GetCoverFromFile, GetMetaFromFile, SniffAudioExt} from "@/decrypt/utils";
import {DecryptResult} from "@/decrypt/entity";
import {parseBlob as metaParseBlob} from "music-metadata-browser";
export async function Decrypt(file: Blob, raw_filename: string, raw_ext: string)
: Promise<DecryptResult> {
const buffer = new Uint8Array(await GetArrayBuffer(file));
let length = buffer.length
for (let i = 0; i < length; i++) {
buffer[i] ^= 163
}
const ext = SniffAudioExt(buffer, raw_ext);
if (ext !== raw_ext) file = new Blob([buffer], {type: AudioMimeType[ext]})
const tag = await metaParseBlob(file);
const {title, artist} = GetMetaFromFile(raw_filename, tag.common.title, tag.common.artist)
return {
title,
artist,
ext,
album: tag.common.album,
picture: GetCoverFromFile(tag),
file: URL.createObjectURL(file),
blob: file,
mime: AudioMimeType[ext]
}
}